"It appears to me to be indisputable that he who I am to-day derives, by a continuous series of states of consciousness, from him who was in my body twenty years ago. Memory is the basis of individual personality, just as tradition is the basis of the collective personality of a people. We live in memory, and our spiritual life is at bottom simply the effort of our memory to persist, to transform itself into hope, the effort of our past to transform itself into our future."